Conversation that just took place in my office:

ME, TO COWORKER: Maybe someone here will go out and get your pizza for you if your pay them the tip money.
SALESWOMAN: I'll go out and get it if you're a big tipper.
ME: Al Gore is married to a big Tipper.
DIFFERENT SALESWOMAN (walking past, five minutes later, in a monotone): You're real funny, Caren.

I've gotten several interesting responses to Dr. Luisa Pimentel Estrada's letter, which I will post here anon.